Welly...depending on the camera--you find a way.
infinity type focusing--yes--you must focus using the camera standards and by moving them....if the lens is long--you go back and forth sometimes---you try to avoid that and it usually isn't necessary with rear controls for focus.
studio type focusing is usually done (by me) with a first zone type focus for magnification desired--pull out the bellows to the calculated length...then lock down and move the whole camera back and forth---when doing portraits, particularly 1:1's that's the ONLY way to focus...move the whole shebang.....it will make you strong like bull.
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